You will need to match the way nymphs hatch to fish other mayfly hatches. Isonychia is the best hatch to learn to nymph on, it's also an easy hatch to fish because Isonychia are very good swimming nymphs and a swing and rise technique is very effective. Other nymphs don't swim as well and a sub surface dead drift is required with a rise at the end of the drift. Learn the Lasering(sp) lift, it's the best sub-surface nymphing technique I've used and even has that natural rise at the end of the drift. This is how I do 90% of my nymph fishing.
The man who coined the phrase "Money can't buy happiness", never bought himself a good fly rod!